Threading device for hook-needles in sewing-machines.



M. T. DENNE.

THREADING DEVICE FOR HOOK NEEDLES IN SEWING MACHINES. APPLICATION FILE!) SEPT-22.1914.

i fi u Patented May 15,1917.

lnvenior. MarK Thomas D enne,

byjafid mflfi' ow Aitys rm: NBRNAS zvsns co mmmu-ma. WASHINGI-nn MARK THOMAS DENNE, 0F RUSHDEN, ENGLAND.

THBEADING DEVICE FOR HOOK-NEEDLES I1\T SEWING-MACHINES.

Application filed September 22, 1914.

To all whom it may concern:

Be it known that I, MARK THOMAS DENNE, a subject of the King of Great Britain and Ireland, residing at Rushden, N orthamptonshire, England, have invented a new and useful Improved Threading Device for Hook-Needles in Sewing-Machines, of which the following is a specification.

This invention has reference to an improved threading device for hook-needles in sewing machines and more particularly to a looper mechanism whereby a loop of thread is passed or guided around the hook needle of a welt sewing or like machine, and it comprises a particular construction and arrangement of the looper itself, and also mechanism for operating same constructed and arranged substantially as hereinafter set forth.

I have illustrated my invention in the accompanying drawing, in which:

Figure 1 shows a side elevation of the looper and its operating mechanism, and

Fig. 2 is a view from the rear at an angle of to the base line.

In the drawing, 1 indicates the usual cam shaft and 2 the usual cam cylinder of a welt sewing machine. The looper 11, which makes a circular or substantially circular movement about the needle, is carried on a spindle S. The said spindle S, which re ceives reciprocating and rocking movements by means to be described is so positioned that its axis lies substantially in the plane in which the needle oscillates and is regularly inclined to the horizontal plane passing through the axis of oscillation of said needle which is perpendicular to the sheet on which the drawing is made. The mechanism whereby the spindle receives its movements will now be described.

Near the cam cylinder 2 I mount a rocking lever 3 on a spindle 3 which is carried in a suitable bearing on the frame of the machine. The said lever has an arm 3 on the free end of which a cam roll 3 that engages in a suitable cam groove in the cylinder 2 is mounted, and it (the lever 3) is coupled to the inclined looper spindle S by means of a block 4 pivotally mounted on the end of the lever and a saddle piece 5 which is secured Specification of Letters Patent.

Patented May 15, 1917.

Serial No. 863,022.

on the rear end of the spindle S by a set screw 6, so that when the cam cylinder rotates the said spindle S is reciprocated axially in its bearings in the frame, a portion of which frame is shown in section and indicated by the reference numeral 7.

In proximity to the rocking lever 3 I mount a bell-crank lever 8 on a pivot 8 to rock at right angles to the said lever 3. One arm of the bell crank lever B is provided with a cam roll 9 which engages in a suitable cam groove in the cylinder 2 and the other arm is provided at its free end with a pivoted block 9 or equivalent which engages the bifurcated end of a lever 5 that is rigidly secured to or forms an extension of the saddle piece 5, so that when the bell-crank lever 8 is rocked the looper spindle has an oscillatory motion imparted to it, the saddle piece 5 and block 4 being constructed to permit the oscillatory movement.

The spindle S which is preferably tubular, carries a looper consisting of a socket part 10 and a tube 11 of small diameter secured to it. As the said spindle is angularly inclined and it and its operating mechanism are arranged in, or as near as possible in, the plane in which the needle 12 oscillates, it consequently follows that said mechanism and the looper spindle may be made much lighter than when arranged in a plane other than that in which the needle reciprocates and with the spindle in a plane parallel with the axis of the needle.

rVhat I claim as my invention and desire to secure by Letters Patent is In a sewing machine, the combination with an oscillatory needle, of a looper spindle situated substantially in the plane of oscillation of the needle and inclined to the horizontal plane passing through the axis of oscillation of the needle, means supporting said spindle for both aXial and oscillatory movement about its axis, a looper secured to the lower end of the spindle, a saddle piece secured to the upper end of the spindle, and an arm extending laterally therefrom in a do nwardly-inclined direction, a lever pivotally mounted at one end and extending at substantially right angles to the spindle, a block carried by the other end of said lever and embraced by said In testimony whereof I have signed my] saddle piece, an arm extending laterally name to this specification in the presence 0i from said lever, a second'lever pivoted intwo subscribing Witnesses. V termediate of its ends and connected to the MARK THOMAS DENNE. arm extending from the saddle piece, and a Witnesses: f V cam for giving oscillatory movement to A. E. W'ILLIAMS, both of said levers. M. POLLQN.

Copies of this patent may be obtained for five cents each, by addressing the 7 Commissioner of Eatenta Washington, D. 0. 

